Really mess with Islamic sharia law and Saudi Arabia

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At this time our nation going on very critical path because of Islamic terrorist activities against Buddhist, Hindus and Cristian people inside country. Now they push Islamic sharia law inside country and also with more than 4500 halal certified products. In this situation Sri Lankans looking for non-halal and we won't be sharia here. Because we see what happen to that Sri Lankan muslim girl Miss. Rizana Nafeek (PEACE BE UPON HER) who work in Saudi Arabia. They announced she killed a baby in house she was working(but many people know it was an accident even Saudi King mention it should be an accident). When it happen she was only 17 years old girl anyway according to the Islamic sharia law she should be die because It's a murder. She had been 5 years in a jail finally they kill her with Sharia. This is an old news. Now turn in to my question. Simply why Islam prefer the only god is Allah and other believers are fake and they should be kill by Islamic believers? resources: http://quran.com/8/12 I have no question if they don't kill Sri Lankan workers just because they worship other religions in side their rooms. Because It's free to worship Islam publicly in Sri Lanka even Sri Lanka is a Sinhala buddhist country more than 80% Sinhalese and more than 75% Buddhists. But there are many Islamic churches. In other hand Saudi have majority Muslim population and they do not let to worship other religions inside Saudi. They big problem is Saudi police arrest a Sri Lankan worker who worshiped and keep a Lord Buddha's statue in his living room in Saudi. Now they going to kill him according to the Sharia Law. But this is only worship his own religion not a murder. Why Saudi police act like this? I feel this is appalling of Islam. Why Allah want these things to happen? http://youtu.be/q3NK1WhjQQ4